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Performance Questions...

performance ? Q2: Do LIKE operations have significant degradation on queries ? My last question is different ... automatically. Even though ObjectDB implements LIKE very efficiently it still might be slower than other comparison operators. An index on the string field could help. LIKE against patterns

String Contains Query Result - Possible?

Lessons 10-Pack I would like to know if it is possible to have a query return the "Program" object ... WHERE description LIKE " [something] " ...but, this doesn't seem like it will work even when using

Is it possible get the All PrimKeys for a given entity class in the DB?

Hi, I would like to retrieve all the primKeys (user defined) by doing something like: TypedQuery<MyClassPrimKey> query = em.createQuery("SELECT mif.primkey FROM MyClass mif ... - but sounds like it is double storage Thanks EKK Emmanuel Keskes It should be possible using a JDO's

Different behavior with persist() and queried instances?

to be being pretty useless.. thanks, Alex quasado Alexander Adam I am getting closer.. looks like ... Alexander Adam Looks like calling merge() *before* modifying the underlying list property does the job ... is this: - Create a class with a simple list in it like in my first post - Open up connection to server to any

Should I be able to persist a JFrame (or gui components in general)?

like this, so that I am not spending a long time (I'm slow) programming what I'll call "mapping the UI ... like this a lot so far. However, in writing the Contact class, I realized I was still mapping ... / enterprise multi tiered philosophy--nevertheless--I decided that I would like to somehow persist

Occasionally slow requests in load testing

and once it starts having this issue it is around 10-15%. If you are referring to something else, I'd like ... , it will not cause 10 seconds wait on writing to disk. If you are referring to something else, I'd like ... the working threads (e.g. database pages) is much more extensive so lock competition is more likely

NULL prefered in ORDER BY?

entries, some do have a hint assigned, some do not (NULL). Now when I do something like SELECT FROM Test ORDER BY hint.name It orders ASC like this (assuming I've got three Test Entities whereas first

Remove not working

program. CBE CBE Looks like ignoreCache set to false is still ignored after the above fix. So this would explain why the Extent appeared to fail on the second access (because it ignored the cache, like

Complex Schema Upgrade not working

Hello, We're trying to upgrade the DB-Schema. Simplied our source/original Schema/Class-Hierarchy looked like this: class contact.Contact class customer.Customer extends contact.Contact class ... , Customer and Member). Our new hierarchy looks like that: - The package "member" has been renamed

Replaying recorded requests...

Hi, I get the following when ODB starts in embedded mode: Replaying recorded requests... then I get something like 500 lines of recordset information. Here is the relevant part of the config file ... has many files like this: mr.odb_nonclosed, mr_1.odb_nonclosed up to mr_10.odb_nonclosed 2

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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